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The fourteen digits of a credit card are to be written in the boxes shown above. If the sum of every three consecutive digits is 18, then the value of x is:
A3
B2
C1
DCannot be determined
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There are 14 blocks so that blocks can sets= 3*4+2
now the total digits =4*18+(tow blocks reains )
total is =72+{18-8=10(for the remaing tow blocks)}=82.....eqation 1.
now the other way is=18+7+18+x+18+18.........eqeation 2.
equation 1=equation 2.
18+7+18+x+18+18=82
by solving this...
x=3. ans.
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